| // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| // @dart = 2.9 |
| |
| /// @assertion bool hasListener |
| /// Whether there is a subscriber on the Stream. |
| /// @description Checks that the property returns correct value. |
| /// @author kaigorodov |
| |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| StreamController controller = new StreamController(); |
| Stream s = controller.stream; |
| Expect.isFalse(controller.hasListener); |
| |
| List events1 = new List(); |
| StreamSubscription ss = s.listen((event) {events1.add(event);}); |
| Expect.isTrue(controller.hasListener); |
| |
| ss.cancel(); |
| Expect.isFalse(controller.hasListener); |
| |
| controller.close(); |
| } |